Christina Milian goes without support in eye-popping gaping shirt unbuttoned to navel

As the grand opening of her pop-up shop approaches, there's little doubt Christina Milian has been poring over every detail of the boutique.

But on Sunday, the 33-year-old looked over one key element to her own outfit when she visited the West Hollywood establishment.

The songbird went braless when she left the We Are Pop Culture shop in a gaping black shirt that exposed her cleavage.

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Forgetting something? Christina Milian went without a bra when she inspected her pop-up shop We Are Pop Culture on Melrose Avenue in West Hollywood on Sunday

Smiling brilliantly, the actress also showed off her hourglass figure with a sexy leather skirt that hugged her hips.

The hit-maker finished off the look with jade green alligator print pumps, while accessorising with large gold hoop earrings.

Christina's makeup was flawlessly applied as usual, and she shone with shimmering eyeshadow and nude lips.

Splash of colour: The songbird teamed her all-black look with a stylish pair of jade green heels

This past weekend, Christina enjoyed a momentary respite from her pop-up shop when she performed at AmericaFest at the Rose Bowl on Independence Day.

Christina is also enjoying a new romance with hip hop artist Lil Wayne.

The reality TV star recently confirmed they are dating, and that the 32-year-old rapper inspired her latest track, Rebel.

Pleased as punch: Milian flashed a brilliant beam as she headed outside

She told ET Online about the meaning of the song: 'I'm so inspired by the relationship that I'm in that it's definitely an experience. It's that careless, hopeless, romantic love – that feeling of "I will do anything for you" and it's just incredible and so yea, "rebel for you" means "I'm all about you."'

However, it will soon be back to work for the singer, whose shop will open to the public on July 6.

We Are Pop Culture is the brain child of Christina and fashion designers, My-Kel and Sam.

The streetwear label, which started online, describes itself as: 'We Are Pop Culture is a destination site that highlights lifestyle, pop culture, and its influences on the world today.'

Christina's acting career is also blossoming with a role in the new show Grandfathered, which will premiere in the Fall on FOX.

Fine tooth comb: The star paid a visit to the shop in June, where an employee was hard at work constructing decorations for the boutique